Earth Day began as a protest in 1970, but its meaning has evolved. Here’s how it changed - and what it represents today.

Scientists have seemingly settled long-standing arguments about whether the components of Earth originated from the inner or ...

Researchers including a number from the University of Exeter, have identified the most urgent unanswered questions about ...

Millions of people around the world will pause, at least for a moment, to mark Earth Day. The annual event is Wednesday.

Earth Day, which began in 1970, is celebrated each year on April 22.

See stunning photos of Earth taken from space by astronauts and robotic spacecraft, celebrating our home planet on Earth Day.

Apophis, a massive near-Earth asteroid, is set to pass just 20,000 miles from Earth on April 13, 2029. The flyby, described ...